CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

decp.info is a French public procurement data explorer — a Dash (Python) web app for browsing, filtering, and visualizing Données Essentielles de la Commande Publique (DECP). The UI is in French.

Commands

Setup

python -m venv .venv && source .venv/bin/activate
pip install ".[dev]"
cp template.env .env   # then customize .env

Development

uv run run.py         # starts Dash with debug=True and hot reload

Production

gunicorn app:server

Tests

uv run pytest                  # run all tests (Selenium-based integration tests)
uv run pytest tests/test_main.py::test_001_logo_and_search   # run a single test

Tests require a running Chrome/Chromium browser. They use DashComposite from dash[testing] with Selenium WebDriver.

Architecture

Multi-page Dash app

src/app.py — creates the Dash app instance, navbar, SEO endpoints (robots.txt, sitemap.xml), Matomo analytics
src/pages/*.py — each page registers itself with @register_page() and owns its own layout and callbacks
run.py — dev entry point; exports server (Flask) for gunicorn

Key pages

Page	URL	Purpose
`recherche.py`	`/`	Search homepage for buyers/contractors
`acheteur.py`	`/acheteur`	Buyer detail with stats, charts, maps
`titulaire.py`	`/titulaire`	Contractor detail
`tableau.py`	`/tableau`	Filterable data table with exports
`marche.py`	`/marche`	Individual contract detail
`observatoire.py`	`/observatoire`	An interactive analytics dashboard

Data layer

Data is stored as Parquet and loaded with Polars (fast columnar operations)
Path set via DATA_FILE_PARQUET_PATH env var; tests use tests/test.parquet
src/utils.py — filtering helpers, search (search_org), link generation, geographic data loading
src/callbacks.py — shared Dash callbacks (e.g. get_top_org_table)
src/figures.py — chart and map components (Plotly Express, Dash Leaflet with marker clustering)
a Parquet file with production data is located at ../decp-processing/decp_prod.parquet (~ 1,5 million records)
the TableSchema of the dataset with the list of field and their definition is located at ../decp-processing/reference/base_schema.json
tests/test.parquet is very small and may not contain all possible columns, only those necessary for testing

UI stack

Dash 3.4 + Dash Bootstrap Components for layout
Plotly Express for charts
Dash Leaflet + Dash Extensions for interactive maps with clustering
Custom CSS in src/assets/css/

Environment

DEVELOPMENT=true enables debug logging and is set automatically during tests
.env file is required at runtime (copy from template.env)

Deployment

main branch → manual deploy to decp.info via GitHub Actions
dev branch → auto-deploy to test.decp.info via GitHub Actions

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